Partial circuit for electric currents.



No.762,957. PATENTED JUNE 21,1904.

G. THOMPSON.

PARTIAL CIRCUIT FOR-ELECTRIC GURRENTS.

APPLIOATION FILED 'AUG. 2, 1902.

no menu.

No. 762,957. PatentedJune21,190d.

' UNITED STATES PATENT OEricE.

GUION THOMPSON, OF DULUTH, MINNESOTA, ASSIGNOR TO THE THOMP- SON SAFETY APPLIANCE COMPANY, A CORPORATION OF NEW JERSEY.

PARTIAL CIRCUIT FOR ELECTRIC CU'RRENTS.

SPECIFICATION forming partof Letters Patent No. 762,957, dated June 21, 1904. Application filed August 2, 1902. Serial No. 118,071. (No model.)

To all h it y concern! closing of said partial circuit, and Fig. 1 is a Be it known that I, GUION THoMPsN,a citidiagram of a partial circuit established on a zen of the United States, residing at Duluth, conveyance which my said partial circuit may in the county of St. Louis and State of Minbe utilized to complete. 5 nesota, have invented certain Improvements In the drawings, a and a are the rails of a in Partial Circuits for Electric Currents, of railway-track, and (1, is a rail or contact exwhich the following is a specification. ternal to saidtrack-rails. Connected at one My invention relates to partial circuits for end to said external rail and extending i'or- 55 electric currents, and has for its object the ward a suitable-distance along said route is a provision of means for establishing a tempoconductor a provided at its free end with a rary partial circuit upon the route of a concontact (0. Connected at one end to said rail veyance which when so established will be a is a conductor (0 extending to the vicinity adapted to complete a circuit partially estabof said conductor (0* and provided at its free lished on a conveyance moving on said route, end with a contact a, .which contacts a and 5 and including a source of electricity carried a may be adapted to be brought into direct thereby and directly or indirectly governing contactual relation by making one of said consignals, engine-controlling means, or other ductors elastic, as (0 Fig. 2, and attaching its mechanisms-on said conveyance. contact to the operating-lever or armature a, 5 With this and other objects in view it conas in said Fig. 2, or, if desired, may be sists in the combination of two stationary conbrought into communication by means of an ductors respectively located at opposite sides intermediate double contact a, as in Fig. 1, of said route, one of which conductors prefwhich contact a is supported by an operaterably constitutes one of the rails of a railing bar or lever a, preferably embodying or 7 way-track and the other of which is short constituting an armature a, which lever is 5 and independent of said track-rails, a conadapted when operated to bring said contact ductor of electricity connected at one end to a into mutual contact with said contacts a said independent conductor and extending and a, thus completing the partial circuit forward a suitable distance along said route from said rail (0 to said rail (0 It is obvious 75 and provided at its free end with a contact, a that said bar a" may be operated by various 3 series of conductors, including arelatively means; but I prefer to construct the same as independent movable contact, extending from 1 an armature or to attach the same to an armathe vicinity of the first said contact to the op ture a which is operated as shown in'Fig, posite rail, and means to govern the position 2, by an electromagnet B, the coil of which is 50 of said independent contact and adapted to included in a normally open circuit including bring said independent contact into temporary a distant normally closed contact governed by contactual relation with the first said contact an armature I), a source of electricity, and a and with the other member of said series. normally open contact, which electromagnet It also comprises certain other construcis primarily energized byinduction from a tions, combinations, and arrangements of transient magnet 0', adapted to becarried past 4 parts, as will be hereinafter set forth and said electromagnet within magnetically influclaimed.- ential distance of the same by a conveyance In the drawings, Figure 1 is a diagram of C, moving on said track, which electromag my partial circuit in normally open condinot will thereupon attract said armature a 9 tion. Fig. 2 is a diagram of a modified conand draw the contact 6 into contact withthe struction thereof. Fig. 3 is a diagram of said contact 6, thereby closing the normally open partial circuit and of one of the controlling contact included in the circuit with said coil, systems invented by me for effecting the the magnetism of which electromagnet will then be maintained by the source 6 included in said circuit. The partial circuit comprising my invention being by said operation of said armature also closed, such condition will be maintained until said transient magnet c reaches the armature b, governing said distant normally closed contact, when said magnet will attract said armature b and break said normally closed contact, whereupon said electromagnet will again become inert and drop its armature, and thereby open said partial circuit.

The utilities of my said partial circuit are manifold; but one illustration will be sufiicient, for which purpose it may be assumed that said partial circuit has been closed, as aforesaid, and that the conveyance bearing said magnet c is at a point between said electromagnet and the distant armature 6. Now comes a following conveyance upon which, as shown in said Fig. 4, is established a partial circuit comprising a battery D or other suitable source of electricity, to the opposite poles of which are connected conductors of electricity, respectively, as at d and d normally separated or insulated from each other and adapted to terminally contact, respectively, with said stationary conductors a and a and upon which conveyance is established a normally closed circuit including said battery D, portions of said conductors d and CF, a safety signal-lamp E, and conductors e and 6 When said conductors d and (F, respectively, contact with said conductors a and (0 (said partial circuit being closed, as aforesaid,) the partial circuit on said conveyance will be completed by said stationary partial circuit on said route, and the battery D on said conveyance will thereupon be short-circuited out of the circuit containing said lamp E, and the light of said lamp will thereupon be extinguished, thereby warning the driver of said conveyance that there is a preceding conveyance between said electromagnet B and said distant armature 6*. 1f, however, my said partial circuit from and including the rail (0 to the rail a be not closed, the safety signal aforesaid will remain undis turbed. It is obvious that said conductor a may also, if desired, be external to the track-rail and constructed similarly to said rail or contact (6 and that the partial circuit on said conveyance may be modified or changed or extended or may include or govern other circuits or signals or constructions, and that the means for operating said lever a or armature a may be varied or extended or modified or incorporated with other constructions or circuits, and that suitable supports or anchorages or fastenings for the several parts may be provided, all within the scope of my said invention.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination of a normally open electric circuit comprising a source of electricity, an electromagnet and a normally open circuitcontrolling contact, an armature adapted to be operated by said magnet while energized, and,-in operative position, to close said contact, a partial circuit comprising a normally open contact adapted to be closed by said armature, conductors extending from the opposite points thereof and provided at their outer ends with normally open contacts, a conveyance, a normally open electric circuit carried by said conveyance and including a source of electricity, conductors extending from the opposite poles of the last said source and provided at their outer ends with normally open contacts adapted to be carried by said conveyance into momentary circuit-extending contact with the contacts at the said outer ends of said partial circuit, and means carried by said conveyance and adapted to momentarily operate said armature after the momentary contact with said partial circuit of the normally open circuit carried by said conveyance, substantially as described.

2. The combination of a normally open electric circuit comprising a source of electricity, a normally closed circuit-controlling contact, an electromagnet and a normally open circuitcontrolling contact, an armature for said magnet adapted when operated to close said normally open contact, a partial circuit comprising a normally open contact adapted to be closed by said armature when operated, conductors extending from the opposite points of the last said normally open contact and provided at their outer ends with normally open contacts, a normally open electric circuit'including a source of electricity, conductors extending from the opposite poles thereof and provided at their outer ends with normally open contacts, a conveyance for carrying the last said normally open circuit into momentary circuit-extending communication with said partial circuit, means carried by said conveyance adapted to momentarily operate said armature after the termination of the momentary extension of the last said normally open circuit by said partial circuit, a lever adapted in operative position to open said normally closed contact, and means carried by said conveyance adapted to momentarily operate said lever subsequent to the initial operation of said armature, substantially as described.

3. The combination of a normally open electric circuit including a source of electricity, an electromagnet and a normally open circuitcontrolling contact, an armature for said magnet adapted when operated to close said contact,. a partial circuit comprising a normally In testimony whereof I have signed this open cn'cult-controlling contact governed by specification 1n the presence of two subscribsaid armature, and conductors extending from ing wltnesses.

the opposite points of the last said open con- GUION THOMPSON. 5 tact and provided at their outer ends With l/Vitnesses:

normally open contacts, substantially as de- J NO. D. W ATSON,

scribed. JAMES T. VVATsoN. 

